SEAI CERTIFIED DEC ASSESSORS FOR COMMERCIAL BUILDINGS
Display Energy
Certificates DECs
We help Irish public bodies and commercial buildings comply with energy regulations by providing professional Display Energy Certificates (DECS). Our certified assessors deliver accurate operational energy ratings that satisfy legal requirements while identifying opportunities to improve your building’s energy performance.
- Over 15 years experience providing energy certificates for all property types.
- Specialising in DEC surveys, EPCs and other services for your property.
- Contact us for free quotes and impartial advice.
What is a Display Energy Certificate?
Display Energy Certificates (DECs) are a legal requirement for many public and commercial buildings in Ireland. They provide an operational energy rating based on actual energy consumption over the previous 12 months. Unlike BERs, which are based on predicted energy use, DECs show how your building really performs in use—highlighting energy efficiency, identifying areas for improvement, and demonstrating compliance. For businesses open to the public, a DEC isn’t just a regulatory obligation—it’s a visible commitment to sustainability and accountability.
Which Buildings Need a Display Energy Certificate?
Display Energy Certificates are legally required for public buildings over 250m² and commercial buildings over 500m² that are frequently visited by the public. Unlike BERs which last 10 years, DECs must be renewed annually and prominently displayed. Certain properties are exempt, including Protected Structures, Temporary Buildings, Places of Worship, Non-Residential Agricultural Buildings, and Buildings Scheduled for Demolition. Each certificate provides a transparent measure of operational energy performance.
Trusted By Leading Businesses
What is a Display Energy Certificate used for?
A Display Energy Certificate (DEC) demonstrates your building’s actual operational energy efficiency to the public, based on real consumption data rather than theoretical predictions. It provides transparency about energy management practices, helps identify improvement opportunities, and facilitates compliance with statutory obligations for public buildings. The operational rating enables meaningful benchmarking against similar facilities, creating accountability and driving continuous improvement in public sector energy performance while showcasing your organisation’s commitment to sustainability.
Our Accreditations & Qualifications
Who is Responsible for the DEC Scheme?
Under the European Union (Energy Performance of Buildings) Regulations, the Sustainable Energy Authority of Ireland (SEAI) is designated as the Issuing Authority for DECs. Building owners or occupiers are legally responsible for obtaining valid certificates, while local Building Control Authorities enforce compliance. Failure to display a valid DEC when required can result in enforcement actions, including potential penalties. Public buildings must prominently display their certificate in a location clearly visible to visitors, demonstrating transparency and regulatory compliance.
Get Your Display Energy Certification
Grade
Your Building
We’ll grade your building from A to G, allowing the public to understand its energy efficiency.
Provide Display Energy Certification
Once certified, you’ll be able to show that experts have assessed your building’s energy efficiency.
DEC
Consultations
You can request a consultation to understand your building’s energy needs and future steps.
How Your DEC is Calculated
A comprehensive Display Energy Certificate (DEC) involves specialised methodology and expert analysis. Our qualified assessors use standardised operational assessment procedures and approved software to transform your building’s actual energy consumption into an accurate performance rating.
How We Calculate Your DEC
Our assessors analyse your property’s energy consumption data from the previous 12 months and input it into the official DEC calculator software. The process includes evaluating electricity, gas, and other fuel usage, adjusting for weather patterns, operating hours, and building type benchmarks. The software then calculates your building’s operational performance on the standardised A to G scale, reflecting its real-world efficiency.
Your commercial DEC Expert
Expedite Your Assessment
Having assessed hundreds of public buildings, I can confirm that preparation makes all the difference. When clients provide complete energy records upfront, we can deliver more accurate DECs in half the time. This not only saves you money but gives us more opportunity to identify meaningful efficiency improvements tailored to your building’s actual usage patterns.
How is a Display Energy Certificate produced?
At Energi IQ, we follow a meticulous, data-driven process to ensure your Display Energy Certificate accurately reflects your building’s operational energy performance. Our qualified assessors analyse your actual consumption over the previous 12 months, comparing it against established benchmarks for similar building types.
Operational Data Collection
Our specialists gather comprehensive energy consumption records from all utilities and fuel sources, establishing a complete 12-month profile of how your building actually performs in day-to-day operation.
Benchmark Comparison
Using specialised DEC calculation software, we process your consumption data against national benchmarks for your specific building category, determining your operational rating on the standardised A-G scale.
Occupancy Pattern Review
We assess your building’s usage characteristics, including opening hours, visitor volumes, and special functions that affect energy demands, ensuring accurate benchmarking against comparable facilities.
Improvement Analysis
We identify practical energy-saving measures based on your actual consumption patterns, delivering actionable recommendations that address your building’s specific operational inefficiencies.
Energy Systems Evaluation
Our thorough examination covers all operational systems influencing energy use, including heating, cooling, ventilation and lighting controls, documenting actual usage patterns rather than theoretical performance.
Certification & Compliance
We compile all required evidence and consumption records, then submit your assessment to the national DEC register, providing you with officially certified documentation ready for prominent public display as required by regulations.
What You Receive With Our DEC Assessment
At Energi IQ, we deliver more than just regulatory compliance. Our comprehensive DEC service provides you with the documentation, insights, and support needed to understand your building’s energy performance and make informed improvements. Our team of fully accredited Irish assessors combines technical expertise with practical knowledge to deliver exceptional value beyond basic certification.
Official DEC Certificate
Government-recognised certificate displaying your building’s A-G operational energy rating, complete with unique reference number and CO₂ emissions data registered in the national database.
Advisory Report
Detailed analysis with practical, prioritised suggestions for improving energy performance. Identifies specific opportunities to reduce consumption and achieve better ratings.
Annual Compliance Solution
Streamlined reassessment services ensure continuous regulatory compliance. Year-on-year comparison tracking demonstrates your commitment to ongoing energy management.
Expert Support & Guidance
Personalised consultation on implementing efficiency measures. Our SEAI-registered assessors explain results clearly and answer all questions about performance improvement.
Your Trusted Partner for Commercial DEC Compliance
At Energi IQ, we deliver high-quality Display Energy Certificate assessments for commercial properties across Ireland. Our SEAI-registered team combines deep industry knowledge with precision data analysis to ensure full compliance with national energy regulations. We don’t just produce certificates—we provide clear, actionable insights that support long-term efficiency and demonstrate your organisation’s environmental responsibility.
We perform on-site inspections to collect verified energy data and building details, ensuring an accurate operational rating. Our method guarantees transparency and complies fully with SEAI guidelines for the issuance of your Display Energy Certificate.
Our assessors transform raw data into valuable insights. With your DEC, you’ll gain expert advice on your building’s real-world performance and discover future energy-saving opportunities, making compliance clear and actionable for every business.
Why choose our DEC service?
Selecting the right partner for your Display Energy Certificate assessment ensures not just compliance but valuable insights that improve your building’s performance. Our specialised expertise in Irish energy regulations and commitment to excellence make us the trusted choice for organisations throughout Ireland.
In Ireland, DECs are required for many public buildings and recommended for commercial ones. Our service ensures your building meets all regulatory obligations, helping you avoid penalties while enhancing your organisation’s reputation for transparency, responsibility, and environmental awareness.
Our team consists of fully qualified, SEAI registered DEC assessors with extensive experience across all building types. This official recognition ensures your certificate meets all regulatory requirements and will stand up to any compliance checks or audits.
Client Testimonials
Energi IQ has consistently delivered exceptional results since we began working with them in 2008. Their team is professional, experienced, and reliable. When we needed an Energy Assessor, Energi IQ not only met our needs, but they also exceeded them. The assessor was punctual, knowledgeable, and efficient. The report was detailed, accurate, and delivered ahead of schedule. From start to finish, the process was seamless. Highly recommended for anyone who wants a professional, dependable Energy Assessment Service.
Energi IQ have been very professional with quick turnaround times in producing our Energy Assessments and registering the final Certificates following successful air permeability testing on a development we have recently completed. They have been very helpful and proactive in advising on the best way to achieve the results that we required for this site, represent good value and provide a fast issue of certification when required. I would certainly use and recommend Energi IQ for future requirements that we have.
Download Your Display Energy Certificate Guide
Complete the form below to access our comprehensive DEC guide. This free resource explains operational assessment requirements, rating methodology, and practical improvement strategies to enhance your public building’s energy performance and demonstrate your commitment to sustainability.
Comprehensive overview of operational energy assessments for public buildings, explaining legal requirements, calculation methods, and how DECs differ from standard BER assessments.
DEC Certificates – More Than Just a Legal Obligation
Four Ways Our DEC Service Delivers Value
Display Energy Certificates aren’t just about compliance—they’re an opportunity to improve your building’s efficiency and reduce operational costs. Our professional assessment service helps you transform a regulatory requirement into a valuable energy management tool that delivers real benefits to your organisation.
Meet Legal Requirements
Avoid potential fines of up to €5,000 with our fully compliant DEC assessments. We ensure your certificate is properly displayed in a prominent location visible to the public, along with a valid Recommendation Report that satisfies all regulatory obligations.
Enhance Building Efficiency
Our detailed Recommendation Report provides practical, actionable advice to improve your building’s energy performance. We identify cost-effective measures that can significantly reduce consumption while improving your operational rating.
Expert Assessment Service
As SEAI registered assessors, we deliver a market-leading service with unmatched customer support. Our reputation is built on technical excellence, clear communication, and reliable assessments that stand up to regulatory scrutiny.
Reduce Carbon & Costs
Transform your DEC into a strategic tool for reducing energy consumption, operational costs, and carbon emissions. Our assessment helps you understand performance patterns and identify the most impactful efficiency improvements.
Understanding BERs vs DECs: What’s the Difference?
Building Energy Rating (BER)
A BER is a standardised assessment of a building’s energy efficiency based on its design and fixed systems. It uses typical assumptions about occupancy and energy use, considering features like insulation, heating, ventilation, and lighting. Valid for ten years, a BER is legally required when constructing, selling, or leasing a commercial building. It measures design performance rather than real-time or operational energy consumption.
Display Energy Certificate (DEC)
A DEC is an operational energy rating that reflects the actual measured energy use of a building over a 12-month period. It captures real consumption during occupancy and benchmarks performance against similar buildings. DECs must be renewed annually and are required for public buildings over 250m² and commercial properties over 500m². It includes both regulated and unregulated energy use, promoting public transparency and energy awareness.
Our Simple Three-Step DEC Process
We begin with a tailored consultation to understand your building. Our certified assessors then carry out a detailed on-site survey, collecting data on heating, lighting, cooling, and ventilation systems to assess actual operational energy use accurately.
We process your energy consumption data using national benchmarks and official DEC software. This allows us to generate your certified Display Energy Certificate, complete with a verified operational rating and associated carbon emissions figure.
You’ll receive a personalised report with energy-saving recommendations to help improve your rating. We also offer ongoing support, including future renewals and compliance check-ins, ensuring long-term improvement and continued regulatory alignment.
How to book a DEC survey?
Booking your Display Energy Certificate assessment with Energi IQ is straightforward and hassle-free. Our streamlined process is designed to minimise disruption to your operations while ensuring we gather all the information needed for an accurate energy performance assessment.
Once we have provided you with a quote, if you wish to go ahead and book we will also need invoicing details and contact details for whoever will be providing further data. We don’t charge up-front, but will invoice you for the work on completion, and release the DEC to you upon receipt of payment.
Get Your Free No Obligation Quote
Begin your journey towards securing your Display Energy Certificate with our FREE quote and expedited service. Contact us today to arrange your initial consultation and take the first step towards a more sustainable and cost-effective future for your public building.
“This company provides excellent service, super helpful and had great knowledge in all areas of building energy efficiency.
I would highly recommend them!”